So... it turns out it could be at Blenders end? ;) I wish importing and exporting would go perfectly with everything all the time, and sadly, that's not often the case. I thought I heard something was changed about the Blender file dialog. Was that in 2.46, and --dare I ask-- is it less terrible now? :D There's not a way…
There were some issues associated with doing a direct import and export of meshes (using Blender as a simple converter), usually OBJ files, where nothing was done to the objects whilst it was in Blender; not sure what goes on behind the scenes but it *would* do funny things like that (always has in fact, much like any…